A method for hoisting and reverse construction of prefabricated plain concrete stands

Abstract

The present invention discloses a prefabricated plain concrete stand hoisting and fixing structure, comprising a circular fixing cavity and a bolt, the upper end of the bolt is installed in the circular fixing cavity, an upper stand, and a protrusion is fixedly connected to one side of the upper stand, and second grouting holes are respectively opened at both ends of the protrusion, and a fixing component is arranged in the second grouting hole, and the fixing component comprises a screw cap, an arc cavity, a push plate, an extrusion plate, an air pipe, and a slide plate, and the two arc cavities are respectively fixedly connected to the screw caps, and one end of the extrusion plate is slidably connected to the arc cavity. After the left side of the table top is fixed to the upper stand, the grouting hole on the right side of the stand is aligned with the second grouting hole on the lower stand, and then concrete is poured into the grouting hole through the grouting hole on the stand and flows to the second grouting hole, so that the table top and the lower stand are cast and fixed as a whole.

Description

Technical Field

[0001] The invention relates to the technical field of hoisting of stands, and in particular to a reverse construction method for hoisting of a prefabricated plain concrete stand. Background Art

[0002] Fair-faced concrete can be cast in place or prefabricated. For example, cast-in-place fair-faced concrete stands require complex processes, large investments, and a long construction period, so cast-in-place is not suitable. Prefabricated fair-faced concrete stands have a flat and smooth surface, regular geometric dimensions, and uniform color. They can be factory-produced and can be used directly after hoisting.

[0003] The construction method of prefabricated plain concrete grandstand panels according to the publication number "CN101525948A" includes the following steps: a. setting at least one beam mounting hole compatible with the horizontal plate of the grandstand panels on the supporting beams at both ends of the grandstand panels; b. prefabricating plain concrete grandstand panels, at both ends of the vertical plates of the grandstand panels, etc.

[0004] The existing lifting sequence is constrained by the embedded ends of the bolts and the grouting ends, and lifting operations can only be carried out from bottom to top, which has a great impact on the construction period. It is impossible to confirm whether the bolts are placed in the center of the grouting holes, which can easily cause the grouting material to overflow when the bolts and the grouting holes are aligned. It is impossible to ensure that the grouting material is uniform and dense, affecting the quality of the node. It has high requirements for processing accuracy and needs to be opened separately. In addition, due to the small tongue and groove, the production accuracy cannot be guaranteed. Summary of the invention

[0005] The purpose of the present invention is to solve the following shortcomings in the prior art: the existing lifting sequence is constrained by the embedded end of the bolt and the grouting end, and the lifting operation can only be carried out from bottom to top, which has a great impact on the construction period. It is impossible to confirm whether the bolt is placed centrally in the grouting hole, which may easily cause the grouting material to overflow when the bolt and the grouting hole are aligned, and it is impossible to ensure that the grouting material is uniform and dense, which affects the quality of the node. It has high requirements on processing accuracy and needs to be opened separately. Moreover, due to the small tongue and groove, the production accuracy cannot be guaranteed. A prefabricated plain concrete stand lifting reverse construction method is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A prefabricated plain concrete stand hoisting and fixing structure comprises a circular fixing cavity and bolts, wherein the upper ends of the bolts are installed in the circular fixing cavity;

[0008] An upper stand, wherein a protrusion is fixedly connected to one side of the upper stand, and second grouting holes are respectively opened at both ends of the protrusion, and a fixing component is arranged in the second grouting hole, and the fixing component includes a thread cap, an arc cavity, a push plate, an extrusion plate, an air pipe, and a slide plate, and the two arc cavities are respectively fixedly connected to the thread cap, and one end of the extrusion plate is slidably connected to the arc cavity, and the push plate is fixedly connected to the end of the extrusion plate away from the arc cavity, and the upper end of the slide plate is respectively slidably connected in the thread cap, and the air pipe is fixedly connected between the thread cap and the arc cavity.

[0009] Preferably, the fixing component further comprises a connecting plate, the connecting plate is fixedly connected between the two sliding plates, and a threaded hole is formed on the connecting plate.

[0010] Preferably, the bolt is threadedly connected to the thread nut.

[0011] Preferably, the bolt is threadedly connected to the connected plate through the threaded hole.

[0012] Preferably, the two push plates are respectively provided with a plurality of limit blocks in an equidistant array, and the limit blocks are arranged on the outer surface of the push plates.

[0013] Preferably, the bolt is hollow, a rotating rod is slidably connected inside the bolt, a first spring is rotatably connected to the upper end of the rotating rod, and one end of the first spring away from the rotating rod is fixedly connected to the upper end of the bolt.

[0014] Preferably, hinge plates are hinged on both sides of the lower end of the rotating rod, and the outer surface of the hinge plate is slidably connected to the inner wall of the bolt.

[0015] Preferably, a second spring is fixedly connected between the lower end of the hinge plate and the rotating rod.

[0016] A method for hoisting and top-down construction of a prefabricated plain concrete stand comprises the following steps:

[0017] S1: A grouting hole matching the upper stand is opened at one end of the table top, and a grouting hole matching the second grouting hole on the lower stand is opened at the other end of the table top, two circular fixed cavities are placed in the grouting holes on the table top, and grouting is performed to fix the circular fixed cavities;

[0018] S2: two screw caps are placed in the first grouting holes on the upper stand respectively, and the bolts are threadedly connected and rotated with the screw caps. The bolts are moved downward and threadedly connected with the threaded holes while rotating. The rotation of the threads can drive the connecting plate to move up and fix the sliding plate to move up in the screw caps. At the same time, the gas inside the screw caps is transmitted to the arc cavity through the gas pipe. As the gas in the arc cavity increases, the extrusion plates can be pushed away from each other respectively. As the two extrusion plates move away from each other, the push plates are pushed to move respectively. At this time, the limit block can contact the inner wall of the first grouting hole to form a pre-fixation for the bolts.

[0019] S3: When pouring the two first grouting holes, by pushing the rotating rod downward and squeezing the first spring, the hinged plate is driven away from the bolt as the rotating rod moves downward. At this time, the lower end of the hinged plate is arranged in an eight-shaped shape under the elastic force of the second spring. Then, the rotating rod is rotated to drive the hinged plate to rotate so as to vibrate the concrete in the first grouting hole to ensure uniform pouring of the concrete in the first grouting hole. Finally, the circular fixing cavity is fixed to the upper end of the bolt to achieve rapid fixation of the table top and the upper stand.

[0020] S4: After fixing the left side of the table top to the upper stand, the grouting hole on the right side of the table top is aligned with the second grouting hole on the lower stand, and then concrete is poured through the grouting hole on the table top and flows to the second grouting hole, so as to realize the integral casting and fixing of the table top and the lower stand.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] As the two extrusion plates move away from each other, they push the push plates to move. At this time, the limit block can contact the inner wall of the first grouting hole to pre-fix the bolts, thereby avoiding the displacement of the concrete pouring bolts in the first grouting hole, which would affect the progress of subsequent work. At the same time, pouring the screw cap and the push plate in the first grouting hole can increase the friction coefficient and avoid the bolts from moving up.

[0023] After fixing the left side of the table top to the upper stand, the grouting holes on the right side of the stand are aligned with the second grouting holes on the lower stand. Then pour the concrete through the grouting holes on the stand and flow to the second grouting holes, so that the table top and the lower stand are cast and fixed as one, and the second grouting holes are quickly aligned to avoid deviation.

[0024] Rotating the rotating rod drives the hinged plate to rotate so as to vibrate the concrete in the first grouting hole, thereby ensuring uniform pouring of the concrete in the first grouting hole. Finally, the circular fixing cavity is fixed to the upper end of the bolt to realize rapid fixation of the table top and the upper stand. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1A schematic diagram of the bolt structure of a prefabricated plain concrete stand hoisting and fixing structure proposed by the present invention;

[0026] Figure 2 This is a front structural schematic diagram of a prefabricated plain concrete stand hoisting and fixing structure proposed by the present invention;

[0027] Figure 3 A schematic diagram of a push plate structure of a prefabricated plain concrete stand hoisting and fixing structure proposed by the present invention;

[0028] Figure 4 A schematic diagram of the arc cavity structure of a prefabricated plain concrete stand hoisting and fixing structure proposed by the present invention;

[0029] Figure 5 A schematic diagram of a wire cap structure of a prefabricated plain concrete stand hoisting and fixing structure proposed by the present invention;

[0030] Figure 6 This is a schematic diagram of the hinged plate structure of a prefabricated plain concrete stand hoisting and fixing structure proposed by the present invention.

[0031] In the figure: 1 upper stand, 2 table top, 3 protrusion, 4 first grouting hole, 5 lower stand, 6 bolt, 7 second grouting hole, 8 circular fixing cavity, 9 arc cavity, 10 push plate, 11 slide plate, 12 connecting plate, 13 threaded hole, 14 thread cap, 15 limit block, 16 extrusion plate, 17 air pipe, 18 rotating rod, 19 first spring, 20 second spring, 21 hinged plate. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Reference Figure 1-6 A prefabricated plain concrete stand hoisting and fixing structure comprises a circular fixing cavity 8 and a bolt 6, wherein the upper end of the bolt 6 is installed in the circular fixing cavity 8.

[0034] The upper stand 1 has a protrusion 3 fixedly connected to one side of the upper stand 1, and second grouting holes 7 are respectively opened at both ends of the protrusion 3. A fixing component is arranged in the second grouting hole 7, and the fixing component includes a screw cap 14, an arc cavity 9, a push plate 10, an extrusion plate 16, an air pipe 17, and a slide plate 11. The two arc cavities 9 are respectively fixedly connected to the screw cap 14, and the two push plates 10 are respectively provided with a plurality of limit blocks 15 in an equidistant array, and the limit blocks 15 are arranged on the outer surface of the push plate 10. One end of the extrusion plate 16 is slidably connected to the arc cavity 9, and the push plate 10 is fixedly connected to the end of the extrusion plate 16 away from the arc cavity 9. The upper end of the slide plate 11 is respectively slidably connected to the screw cap 14, and the bolt 6 is threadedly connected to the screw cap 14. The air delivery pipe 17 is fixedly connected between the threaded cap 14 and the arc-shaped cavity 9. The fixing component also includes a connecting plate 12, which is fixedly connected between the two slides 11. A threaded hole 13 is provided on the connecting plate 12. The bolt 6 is threadedly connected to the threaded cap 14 and rotates. The bolt 6 is threadedly connected to the connected plate 12 through the threaded hole 13. While the bolt 6 rotates, it moves downward and is threadedly connected to the threaded hole 13, thereby pre-fixing the bolt 6 to avoid the displacement of the bolt 6 during the concrete pouring 10 in the first grouting hole 4, which affects the progress of subsequent work. At the same time, the threaded cap 14 and the push plate 10 are poured in the first grouting hole 4, which can increase the friction coefficient and prevent the bolt 6 from moving upward.

[0035] The bolt 6 is hollow, and a rotating rod 18 is slidably connected inside the bolt 6. The upper end of the rotating rod 18 is rotatably connected to a first spring 19, and one end of the first spring 19 away from the rotating rod 18 is fixedly connected to the upper end of the bolt 6. Both sides of the lower end of the rotating rod 18 are hinged with hinged plates 21 respectively. The outer surface of the hinged plate 21 is slidably connected to the inner side wall of the bolt 6, and a second spring 20 is fixedly connected between the lower end of the hinged plate 21 and the rotating rod 18. Rotating the rotating rod 18 drives the hinged plate 21 to rotate, so as to vibrate the concrete in the first grouting hole 4, thereby ensuring uniform pouring of the concrete in the first grouting hole 4.

[0036] A method for hoisting and top-down construction of a prefabricated plain concrete stand comprises the following steps:

[0037] S1: A grouting hole matching the upper stand 1 is opened at one end of the tabletop 2, and a grouting hole matching the second grouting hole on the lower stand 5 is opened at the other end of the tabletop 2, two circular fixing cavities 8 are placed in the grouting holes on the tabletop 2, and grouting is performed to fix the circular fixing cavities 8;

[0038] S2: Place the two screw caps 14 in the first grouting holes 4 on the upper stand 1 respectively, and at the same time, the bolt 6 is threadedly connected to the screw cap 14 and rotated. The bolt 6 moves downward while rotating and is threadedly connected to the threaded hole 13. The rotation of the bolt 6 can drive the connecting plate 12 to move up and fix the sliding plate 11 to move up in the screw cap 14. At the same time, the gas squeezed inside the screw cap 14 is transmitted to the arc cavity 9 through the gas pipe 17. As the gas in the arc cavity 9 increases, the squeezing plates 16 can be pushed away from each other. As the two squeezing plates 16 move away from each other, the push plates 10 are pushed to move. At this time, the limit block 15 can contact the inner wall of the first grouting hole 4 to pre-fix the bolt 6.

[0039] S3: When pouring the two first grouting holes 4, by pushing the rotating rod 18 downward and squeezing the first spring 19, as the rotating rod 18 moves downward, the hinged plate 21 is driven away from the bolt 6. At this time, the lower end of the hinged plate 21 is arranged in an eight-shaped shape under the elastic force of the second spring 20. Then, the rotating rod 18 is rotated to drive the hinged plate 21 to rotate, so as to vibrate the concrete in the first grouting hole 4, thereby ensuring uniform pouring of the concrete in the first grouting hole 4. Finally, the circular fixing cavity 8 is fixed to the upper end of the bolt 6 to realize rapid fixation of the table top 2 and the upper stand 1.

[0040] S4: After fixing the left side of the table top 2 to the upper stand 1, the grouting hole on the right side of the table top 2 is aligned with the second grouting hole 7 on the lower stand 5, and then concrete is poured through the grouting holes on the table top 2 and flows to the second grouting hole 7, so that the table top 2 and the lower stand 5 are cast and fixed as a whole.

[0041] In the present invention, a grouting hole matching the upper stand 1 is opened at one end of the table top 2, and a grouting hole matching the second grouting hole on the lower stand 5 is opened at the other end of the table top 2. Two circular fixing cavities 8 are placed in the grouting holes on the table top 2, and grouting is performed to fix the circular fixing cavities 8. Two threaded nuts 14 are respectively placed in the first grouting holes 4 on the upper stand 1, and at the same time, the bolts 6 are threadedly connected to the threaded nuts 14 and rotated. The bolts 6 move downward and are threadedly connected to the threaded holes 13 while rotating. The rotation of the bolts 6 can drive the connecting plate 12 to move upward and fix the sliding plate 11 in the threaded nuts 14. At the same time, the gas squeezed inside the threaded nuts 14 is transmitted to the arc cavity 9 through the gas pipe 17. As the gas in the arc cavity 9 increases, the squeezing plates 16 can be pushed away from each other respectively. As the two squeezing plates 16 move away from each other, the push plates 10 are pushed to move respectively. At this time, the limit block 15 can contact the inner wall of the first grouting hole 4 to form a pre-fixation of the bolts 6.

[0042] When pouring the two first grouting holes 4, by pushing the rotating rod 18 downward and squeezing the first spring 19, the rotating rod 18 moves downward and drives the hinged plate 21 away from the bolt 6. At this time, the lower end of the hinged plate 21 is arranged in an eight-shaped shape under the elastic force of the second spring 20. Then, the rotating rod 18 is rotated to drive the hinged plate 21 to rotate, so as to vibrate the concrete in the first grouting hole 4, thereby ensuring uniform pouring of the concrete in the first grouting hole 4. Finally, the circular fixing cavity 8 is fixed to the upper end of the bolt 6 to realize rapid fixation of the table top 2 and the upper stand 1.

[0043] After fixing the left side of the table top 2 to the upper stand 1, the grouting hole on the right side of the table top 2 is aligned with the second grouting hole 7 on the lower stand 5, and then concrete is poured through the grouting hole on the table top 2 and flows to the second grouting hole 7, so that the table top 2 and the lower stand 5 are cast and fixed as a whole.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A prefabricated plain concrete stand hoisting and fixing structure, comprising a circular fixing cavity and bolts, characterized in that: The upper end of the bolt is installed in the circular fixing cavity; An upper stand, wherein a protrusion is fixedly connected to one side of the upper stand, and second grouting holes are respectively opened at both ends of the protrusion, and a fixing component is arranged in the second grouting hole, and the fixing component includes a thread cap, an arc cavity, a push plate, an extrusion plate, an air pipe, and a slide plate, and the two arc cavities are respectively fixedly connected to the thread cap, and one end of the extrusion plate is slidably connected to the arc cavity, and the push plate is fixedly connected to the end of the extrusion plate away from the arc cavity, and the upper end of the slide plate is respectively slidably connected in the thread cap, and the air pipe is fixedly connected between the thread cap and the arc cavity.

2. The prefabricated plain concrete stand hoisting and fixing structure according to claim 1 is characterized in that: The fixing component also includes a connecting plate, which is fixedly connected between the two sliding plates and has a threaded hole.

3. The prefabricated plain concrete stand hoisting and fixing structure according to claim 1 is characterized in that: The bolt is threadedly connected to the screw nut.

4. The prefabricated plain concrete stand hoisting and fixing structure according to claim 2 is characterized in that: The bolts are threadedly connected to the connected plates through the threaded holes.

5. The prefabricated plain concrete stand hoisting and fixing structure according to claim 1 is characterized in that: A plurality of limit blocks in an equidistant array are respectively arranged on the two push plates, and the limit blocks are arranged on the outer surfaces of the push plates.

6. The prefabricated plain concrete stand hoisting and fixing structure according to claim 1 is characterized in that: The bolt is hollow inside, a rotating rod is slidably connected inside the bolt, a first spring is rotatably connected to the upper end of the rotating rod, and one end of the first spring away from the rotating rod is fixedly connected to the upper end of the bolt.

7. The prefabricated plain concrete stand hoisting and fixing structure according to claim 6 is characterized in that: Both sides of the lower end of the rotating rod are respectively hinged with hinge plates, and the outer surface of the hinge plate is slidably connected with the inner side wall of the bolt.

8. The prefabricated plain concrete stand hoisting and fixing structure according to claim 7 is characterized in that: A second spring is fixedly connected between the lower end of the hinge plate and the rotating rod.

9. A reverse construction method for a prefabricated plain concrete stand hoisting and fixing structure according to any one of claims 1 to 8, comprising the following steps: S1: A grouting hole matching the upper stand is opened at one end of the table top, and a grouting hole matching the second grouting hole on the lower stand is opened at the other end of the table top, two circular fixed cavities are placed in the grouting holes on the table top, and grouting is performed to fix the circular fixed cavities; S2: two screw caps are respectively placed in the first grouting holes on the upper stand, and the bolts are threadedly connected and rotated with the screw caps. The bolts are moved downward and threadedly connected with the threaded holes while rotating. The rotation of the bolts can drive the connecting plate to move up and fix the sliding plate to move up in the screw caps. At the same time, the gas squeezed inside the screw caps is transmitted to the arc cavity through the gas pipe. As the gas in the arc cavity increases, the squeezing plates can be pushed away from each other. As the two squeezing plates move away from each other, the push plates are pushed to move. At this time, the limit block can contact the inner wall of the first grouting hole to form a pre-fixation for the bolts. S3: When pouring the two first grouting holes, by pushing the rotating rod downward and squeezing the first spring, the hinged plate is driven away from the bolt as the rotating rod moves downward. At this time, the lower end of the hinged plate is arranged in an eight-shaped shape under the elastic force of the second spring. Then, the rotating rod is rotated to drive the hinged plate to rotate so as to vibrate the concrete in the first grouting hole to ensure uniform pouring of the concrete in the first grouting hole. Finally, the circular fixing cavity is fixed to the upper end of the bolt to achieve rapid fixation of the table top and the upper stand. S4: After fixing the left side of the table top to the upper stand, the grouting hole on the right side of the table top is aligned with the second grouting hole on the lower stand, and then concrete is poured through the grouting hole on the table top and flows to the second grouting hole, so as to realize the integral casting and fixing of the table top and the lower stand.

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